Question

What is force? What is pressure? Explain about turning effect of force?

Answer 1

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In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. In SI base units: kg·m/s2

• Other units: dyne, pound-force, poundal, kip, kilopond
• Derivations from other quantities: F = m
• SI unit: Newton

Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid. ... In SI units, pressure is measured in pascals; one pascal equals one newton per square metre. Atmospheric pressure is close to 100,000 pascals.

• In SI base units: 1 N/m2, 1 kg/(m·s2), or 1 J/m3
• Derivations from other quantities: p = F / A
• Dimension: M L−1 T−2
• SI unit: Pascal

A force may cause an object to turn about a pivot. The turning effect of a force is called the moment of the force. Moments act about a pivot in a clockwise or anticlockwise direction.

Hope it helps you...

Answer 2

Force:-

The force cannot be seen or felt but can be explained on the basis of effects caused by it.

Force as that external push or pull acting on an object which changes or tends to change the state of rest for the state of uniform linear motion of an object. A force may also deform an object.

Pressure:-

Force acting normally on a unit surface area is called pressure. Liquid and gases exert pressure in all directions.

Turning effect of force:-

A force is associated with translation motion in which an object moves as a whole along a given path. However, under suitable conditions, A force can turn an object about a given axis. This is known as turning effect of force.

Example:-

♦ When you apply force on the handle of a door, the door turns around the hinges.

♦ When a driver applies a force on the steering wheel of his car, it causes turning effect on the wheel.

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